1561454043 has 4 divisors (see below), whose sum is σ = 2081938728. Its totient is φ = 1040969360.

The previous prime is 1561453997. The next prime is 1561454051. The reversal of 1561454043 is 3404541651.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1561454043 - 2⁶ = 1561453979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1561453995 and 1561454013.

It is not an unprimeable number, because it can be changed into a prime (1561454093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260242338 + ... + 260242343.

It is an arithmetic number, because the mean of its divisors is an integer number (520484682).

Almost surely, 2^1561454043 is an apocalyptic number.

1561454043 is a deficient number, since it is larger than the sum of its proper divisors (520484685).

1561454043 is an equidigital number, since it uses as much as digits as its factorization.

1561454043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520484684.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 1561454043 is about 39515.2381113919. The cubic root of 1561454043 is about 1160.1382224808.

Adding to 1561454043 its reverse (3404541651), we get a palindrome (4965995694).

The spelling of 1561454043 in words is "one billion, five hundred sixty-one million, four hundred fifty-four thousand, forty-three".